Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa0d404458b72e9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 14:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c85ee4f89e714ee2cdda11a16fa12773 SHA-1: 6eea7a4e58d6b66bb2b09dcac7d8c06c340a573a SHA-256: ffa0d404458b72e91db5aad0ab2bb685041f260567e08f85562573afa7910a7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were extracted, the presence of numerous external URLs, many with unknown reputations, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing analysis of its specific content or intent beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.gyndoktors.de/ckfinder/userfiles/files/45857709140.pdf In PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/nusatiloturevabiforine.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/25692064737.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/buvewitam.pdfIn PDF document text
    • http://packturf.fr/files/92783285803.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/65813630043.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tupapememezapiteto.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/32219439010.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/44223431916.pdfIn PDF document text
    • http://agilesolutions.in/uploads/xawidujopiweta.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/pimedidedobizusuwozezu.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/91029049457.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/xuziruveberani.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/xixoruvupupatibefejeven.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/gexuloxozemebaviwowolu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/xilakafuguzu.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/58304267022.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/80906398485.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613168b4910ec---96664647249.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/81409850239.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/zajuvarikifudikabar.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/torasugosipaxevatebu.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090516272754.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/biwabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+move+files+from+internal+memory+to+sd+cardPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 19048 bytes
SHA-256: 78c0f3902d36ba771e1bfe7045b42aa1a65325e9eb41e86c5ce4a995cf0da45a
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10892 bytes
SHA-256: 4845aed09d795d1a46e63bde40fabf657b269e341cde6c42e5a4191d77a14da0
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1